Asymmetric Double Michael Reaction Catalyzed by Simple Primary Amine Catalysts: A Straightforward Approach to Construct Spirocyclic Oxindoles
作者:Xiya Luo、Liangliang Wang、Lin Peng、Jianfei Bai、Lina Jia、Guangyun He、Fang Tian、Xiaoying Xu、Lixin Wang
DOI:10.1002/cjoc.201100543
日期:2012.5
The enantioselective doubleMichaelreaction of N‐Boc‐3‐nonsubstitued oxindoles with dienones catalyzed by chiral monoimide protected cyclohexane‐1,2‐diamines was developed. A wide range of optically active spirocyclic oxindoles were obtained up to 98% yield and up to 89% ee.
Synthesis of 2-(1,5-diaryl-1,4-pentadien-3-ylidene)-hydrazinecarboximidamide hydrochloride catalyzed by p-dodecylbenzenesulfonic acid in aqueous media under ultrasound irradiation
作者:Ji-Tai Li、Chao Du、Xiao-Ya Xu、Guo-Fen Chen
DOI:10.1016/j.ultsonch.2012.02.009
日期:2012.9
precursors in synthesis of many natural products and drug molecules. The use of ultrasound, p-dodecylbenzenesulfonic acid (DBSA) and water as solvent improved the synthesis of different 2-(1,5-diaryl-1,4-pentadien-3-ylidene)-hydrazinecarboximidamide hydrochlorides. The best reaction conditions for the condensation of 1,5-diphenyl-1,4-pentadien-3-one with aminoguanidine hydrochloride were as follows:
Phosphazene Base-Catalyzed Double Michael Addition: Stereoselective Synthesis of Cyclohexanones
作者:Yang-Guo Li、Yang Zhang、Guang-Fen Du、Cheng-Zhi Gu、Lin He
DOI:10.2174/1570178615666180912115748
日期:2018.12.4
Phosphazene bases have been utilized as efficient organocatalysts to catalyze the double Michael additions of divinyl ketones with active methylenes to afford functionalized cyclohexanones in 36-91% yields with >25:1 diastereoselectivity.
作者:Jimei Li、Jie Zhang、Mingfei Li、Chenyang Zhang、Yongkun Yuan、Renhua Liu
DOI:10.1039/c8cc09369e
日期:——
2-hydroxy-1,4-naphthoquinones with olefins to produce naphtha[2,3-b]furan-4,9-diones and hydrogen (H2). The reaction is catalyzed by commercially available Pd/C without oxidants and hydrogen acceptors, thereby providing an intrinsically waste-free approach for the synthesis of functionalized and potentially biologically relevant naphtha[2,3-b]furan-4,9-diones.
已经开发了一种反向氢解工艺,用于将2-羟基-1,4-萘醌与烯烃进行两点偶联,以生产石脑油[2,3 - b ]呋喃-4,9-二酮和氢(H 2)。该反应由市售的Pd / C催化,不含氧化剂和氢受体,从而为合成功能化的和潜在生物学相关的石脑油[2,3 - b ]呋喃-4,9-二酮提供了一种本质上无浪费的方法。
Double Michael addition of nitromethane to divinyl ketones: A remarkably positive effect of additive
作者:Yongqi Yao、Yingying Liu、Ling Ye、Feng Chen、Xinying Li、Zhigang Zhao、Xuefeng Li
DOI:10.1016/j.tet.2017.03.018
日期:2017.4
An efficient double Michaeladdition of nitromethane to divinyl ketones was established in good to high yields (75–99%). A wide range of cyclohexanones were obtained with excellent diastereocontrol (up to >20:1 dr) and enantioinduction (91–99% ee) in a one-pot fashion. The involvement of basic additive significantly enhanced the reactivity of this cascade sequence.